HDR Series (600-2,000 CFM)
Heatless Regenerative Dryers
Next Air’s HDR Rental Heatless Series dryers are engineered for exceptional durability and mobility no matter the application, to provide temporary and reliable dry air under harsh conditions in any environment. The HDR is equipped with multiple stages of filtration and a twin tower regenerative dryer for compressed air dehydration. Packaged on a portable heavy-duty skid, these dryers ensure high quality compressed air in accordance with ISO8573-1, the international standard for compressed air quality.
With global standardization and rental applications in mind, Next’s HDR series dryers have incorporated standard design features that are often considered option adders. The HDR comes standard with mounted pre & post-filtration and stainless-steel control air tubing.
The design pressure of its pressure vessels is rated at (200 psig / 13.7 bar) with the industry standard being (150 Psig /10.3 Bar). In addition, Next’s pressure vessels on models (600 to-2000+cfm) are partnered with an ASME VIII and CRN Certification. The UL and CUL-certified electrical panels are protected by a NEMA 4x Stainless steel electrical enclosure. The HDR series is also accompanied by a rugged draggle skid packaged within a 3-sided caged enclosure. Next’s comprehensive option adders allow the dryer to meet any application it is dealt with. Offering dewpoint readings of-40 °F/ °C to-100 °F/-73.3°C
HDR Series Features
- 4-sided fork pocket access built on rugged draggable skid
- Horizontal Purge Exhaust Mufflers
- Mounted Filtration
- Tower Pressure Gauges
- NHDC-2200, Robust Digital Controller
- Stainless Steel Desiccant Strainers
- UL, CUL, Electrical Certification
- Counter-Current Re-Pressurization
- ASME, CRN Code Welded Pressure Vessel Certification
- NEMA 4X Stainless steel Electrical Enclosure
- Stainless Steel Angle Body Valves / Butterfly Valves
- Field Adjustable Drying Cycle Time (10,15min)
- Tower Pressure Relief Valves
- Separate Drain and Fill Port
- Purge Adjustment Valve
- Fail Safe Design
- Purge Flow Indicator
- Common Alarm Output
- 4-Sided Steel Rugged Protective Cage Enclosure
- Optimal tower size for low velocities, high contact time and minimal desiccant fluidization
- Liquid Filled Pressure Gauges
- Marine Grade 2 Part Epoxy Primer & Paint
- ASME, CRN Code Welded Pressure Vessel Certification
NHDC-2200 Controller
- Digital Text Display
- 4-line membrane interface with individual process stage indicator lights
- Run info screen with stage indicator lights
- Power On / Off Switch
- Run Info Screen
- Dryer Run Time and Cycle Count
- Dry Alarm Contact
- Filter Militance Timer
- User selectable Cycle Times:
- 6 Minutes optional
- 10 Minutes standard
- 15 Minutes standard
- 5 Output Connections
- Digital Dew Point Control DCC Active / Inactive Switch
Operating Voltage
- 110, 115 V / 1 PH / 50-60 HZ
- 230/208/220 V / 1 PH / 50-60 HZ –(Optional)
- 24 V DC- (Optional)
Pressure Vessel Certification
- ASME VIII, CRN
(HDD-80-2500) All Provinces
Control Panel Certification
- UL & CUL
- CSA- (Optional)
Pre & Post Filtration Microns
- Control-Filtration grade 1 μm
- Pre-Filtration grade 0.01 μm
- Post-Filtration grade 1 μm
- Moisture Separator
Electrical Enclosure Rating
- NEMA 4x Stainless
Average Purge Air*
- 15%
Outlet Pressure Dew Point
- -40° F / ° C
- -100 ° F / -73° C (Optional)
Min/Max Inlet Air Temperature ° F / ° C
- 40/120 ° F
- 4.4/48 ° C
Min/Max Operating Pressure
- 60/150 Psig
- 4 / 10 Bar
Design Pressure
- 200 Psig
- 13.7 Bar
HDR Series Models
Correction Factors
*Additional Flows Available Upon Request
Air Flow Capacity = Operating Pressure x Inlet Air Temperature
Additional Flows available on request.
Correction Sample:
If a compressor delivers 500 scfm at 120 psi pressure with a 120°F inlet temperature, please choose your dryer model as follows:
(500 scfm / 1.08 / .75) =617 scfm, therefore an HDR-600 would be needed.
HDR Optional Features
(If an option is not listed, please contact our sales team to accommodate any additional options.)
ALTERNATE VOLTAGES:
- ALT-V-1: 208-230 VOLTS / 1 PHASE / 50-60 HZ
- ALT-V-2: 24 VOLT DC
- ALT-V-3: 12 VOLT DC
- PC: PNEUMATIC CONTROL
ELECTRICAL ENCLOSURE:
- N4: NEMA 4: ELECTRICAL ENCLOSURE
- N4X-P: NEAMA 4X: POLYCARBONATE ELECTRICAL ENCLOSURE
- N4X: NEMA 4X: STAINLESS STEEL ELECTRICAL ENCLOSURE
- N7: NEMA 7 EXPLOSION PROOF
CONTROLLER:
- ALT-C-1 NHDC-2300:
- ALT-C-3 NHABC: (ALLEN BRADLEY INTERFACE)
- ALT-C-4 NHSC: (SIEMENS INTERFACE)
CONDENSATE DRAIN:
- EFD: EXTERNAL FLOAT DRAIN
- EZLD: ELECTRONIC ZERO LOSS DRAIN
- PZLD: PNEUMATIC ZERO LOSS DRAIN
- HPTD: HIGH PRESSURE TIMER DRAIN
DEW POINT & DIGITAL MONITORING:
- DCC+DDP: DEMAND CYCLE CONTROL
- DDPM-40: DIGITAL DEW POINT MONITOR (-40° F/ -73° C)
- DDP-40: DIGITAL DEW POINT SENSOR (-40° F/°C)
- DDP-100: DIGITAL DEW POINT SENSOR (-100° F/ -73° C)
- FTS: FAILURE TO SWITCH ALARM
- DCA: DRY CONTACT ALARM
- ESS: EMERGENCY STOP SWITCH
- RSS: REMOTE START / STOP
BYPASS:
- 3VBP: THREE VALVE BYPASS
- 9VBP: NINE VALVE BYPASS
FILTRATION:
- DPF DUAL PRE FILTER
- DAF: DUAL AFTER FILTER
- SP-F: SPECIAL FILTER CONFIGURATION
- FS: FILTER SKID
- RSS: REMOTE START / STOP
PACKAGES:
- LAP: LOW AMBIENT PACKAGE
- SZ: SUBZERO PACKAGE
- RS: RENTAL SKID
CONSTRUCTION:
- NYM: NO YELLOW METAL
- SP-DIM: SPECIAL – DIMENSION
- CSA: CANADIAN STANDARDS ASSOCIATION
- CRN: CANADIAN REGISTRATION NUMBER (3000+ CFM)
- BTS: BUILT TO SUIT
- IOPG: INLET-OUTLET PRESSURE GAUGE
- IOTG: INLET-OUTLET TEMPERATURE GAUGE
- TTG: TANK MOUNTED TEMPERATURE GAUGE
- VMI: VISUAL MOISTURE INDICATOR
- SST: STAINLESS STEEL CONTROL AIR TUBING
- CR: CONTROL LINE PRESSURE REGULATOR
- EPH: ELECTRICAL PANEL HEATER
- AC: AFTERCOOLER
- TAG: STANDARD STAINLESS STEEL ID TAGS
- MGP: MARINE GRADE 2 PART EPOXY PRIMER & PAINT
- LP: LOW PROFILE
Your next step toward working with NEXT Air & Gas is to contact us for a Quote. Fill out the information below and give us the appropriate information needed to get started. Be sure to fill out all the contact information and our team will reach out with any questions or concerns.
If you’d rather speak to Sales Engineering, feel free to contact us at (865) 635-8178.
Below are links to product information and brochures. Please click and download at your convenience. If you have any questions or suggestions on materials you think would be helpful, please call us at (865) 635-8178.
Principles of Operation
The NEXT HDR series is extremely simple and efficient in design. It uses dry compressed air for regeneration. The hard, attrition-resistant activated alumina is contained in dual towers. While the compressed air is being dried in one tower, the desiccant in the other tower is reactivated.
For regeneration of the desiccant, a small amount of the dried air (from the drying tower) is expanded to near atmospheric pressure in the regenerating tower. Because they require neither heat nor blower and utilize up draft drying and counter flow regeneration, the dry air becomes super dry on expansion and readily absorbs the moisture from the saturated desiccant bed.
HDR series offers maximum reliability. An HMI and PLC control the entire drying and regeneration process. Replacement of desiccant every few years is about the only maintenance cost.
Due to their low initial cost and low maintenance cost, HDR dryers are generally used whenever sufficient compressed air capacity is available.
OVERVIEW
Next Air & Gas Performance Advantages
The performance of any desiccant dryer depends on the quality of its key components. Next Air & Gas uses the best available valves, controllers and desiccant. With accurately designed and sized components, the dryers are manufactured to provide you with years of trouble-free operation.
Robust Digital Controller
- Digital Text Display
- 4-line membrane interface with individual process stage indicator lights.
- Run info screen with stage indicator lights
- Power On / Off Switch
- Run Info Screen
- Dryer Run Time and Cycle Count
- Dry Alarm Contact
- Filter Militance Timer
- User Selectable Cycle Times:
- 6 Minutes Optional
- 10 Minutes Standard
- 15 Minutes Standard
- 5 Output Connections
- Digital Dew Point Control DCC Active Inactive Switch
Digital Dewpoint Transmitters Optimize Operations
NEXT’s FAN-500 and 510 are the ideal dew point sensors for monitoring dew point changes for our desiccant dryers. If your needs include a set dew point of -40° F or -100° F, NEXT’s range of dew point sensors has it covered.
- Modbus-RTU Interface
- Higher Resolution of Sensor Signal Through Improved Evaluation Electronics
- Integrated Display (Fan-500)
- Pressure-tight up to 5,000 psig./350 Bar (special version)
- Extreme Long-Term Stability
- Quick Response Time
Quality Desiccant Media
Next Air & Gas uses a mixture of adsorption media in its heatless range of desiccant dryers to achieve consistent dewpoint. Activated Alumina, Molecular Sieve and Silica Gel are used in varying ratios depending on the application. The long lasting, high crush strength media has a very high surface/volume ratio. Beaded activated alumina is used as the adsorption media in heated desiccant dryers. The beads exhibit a very high internal surface area and high moisture separation efficiency. Each lot of desiccants is thoroughly tested for density, moisture content, abrasion resistance, surface area, mesh size and granule strength to assure that it meets strict design requirements.
Butterfly Valves for Precise Control
These versatile, high-performance butterfly valves are used by Next Air & Gas to provide you with precision control and complete bubble-tight shut off. The digitally controlled actuators provide an easy PLC interface and feature fast response time. The tongue-and-groove seat design feature ensures complete isolation of flowing media from the body and stem. Rugged and reliable, these valves are designed to provide years of trouble-free service.
Angle Body Piston Valve
These high-performance, 2-way direct acting valves are designed for reliability and durability. They utilize a profiled disc in conjunction with a high-resolution compact positioner and linear feedback potentiometer to provide precise proportional flow. The stainless-steel internals and a tough fiber composite actuator body, along with the use of oversized bearing and Viton® seals, make it possible to consistently provide smooth piston movement for years of trouble-free service. Angle body valves are used to control depressurization of the regenerating vessel and to control the dry purge air flow during the cooling phase of the process. Angle body valves offer high flow rates and long service life in compact, economical packages.
State-of-the-art Check Valve
Check valves are used at the dryer outlet and on the hot air regeneration lines. They are designed with large ports to minimize pressure loss. Outlet check valves incorporate a stainless-steel disc and O-rings while hot air regeneration valves utilize a metal-to-metal seal to withstand elevated temperatures. High Temperature with a water-combination swing check valves are flow activated. The elliptical shape of the inlet port accelerates the inlet media through the valve. The disc’s angle and shape allow the air to travel faster around the disc, thus creating lift like an aircraft wing, and opens the valve in the full position even at a low flow rate.
Pressure Vessels
HDR desiccant vessels have been designed with a wide diameter for a large cross- sectional flow area. This results in a low flow velocity which minimizes both pressures drop across the bed and attrition of the desiccant itself. The Vessels incorporate the following additional features:
- Stainless steel inlet and outlet air diffusers for even flow distribution
- Stainless steel bed support on units above 3,000 scfm
- Desiccant fill and drain ports
- 1/16” corrosion allowance
- Operating pressure gauge on each vessel
- Pressure relief Valve on each vessel
PREMIUM PLEATED & WRAPPED COMPRESSED AIR FILTERS
Next offers superior filtration from 1 micron to 0.01 micron, and connections from ½” NPT to 10” FLG. Next Filters are engineered to be efficient under any parameter. Next elements offer a durable element construction with an efficient drain layer to ensure continued performance after optimal element change periods.
